Abstract

We theoretically investigate optical Aharonov-Bohm (AB) effects on trion and biexciton
in the type-II semiconductor quantum dots, in which holes are localized near the center
of the dot, and electrons are confined in a ring structure formed around the dot.
Many-particle states are calculated numerically by the exact diagonalization method.
Two electrons in trion and biexciton are strongly correlated to each other, forming
a Wigner molecule. Since the relative motion of electrons are frozen, the Wigner molecule
behaves as a composite particle whose mass and charges are twice those of an electron.
As a result, the period of AB oscillation for trion and biexciton becomes h/2e as a function of magnetic flux penetrating the ring. We find that the magnetoluminescence
spectra from trion and biexciton change discontinuously as the magnetic flux increases
by h/2e.